#include <stdio.h>

int main(){
    int n,step=0;
    scanf("%d",&n);
    while(n!=1){
        if(n%2==0){
            n=n/2;
        }else{
            n=(3*n+1)/2;   
        }
        step++;
    }
    printf("%d\n",step);
    return 0;
}